If someone could program a visualization tool that would generate such diagrams automatically, that would be even cooler (but likely a mission impossible).
Automatic generation would be really tough because of all the levels of abstraction traversed in this diagram in particular... But tools like Mermaid / PlantUML can get you in the ballpark, and PGF/TikZ could be a reasonable target if you want to attack that mission by generating text instead of images.
If someone could program a visualization tool that would generate such diagrams automatically, that would be even cooler (but likely a mission impossible).